Koskamo

CVSS Calculator MCP

A lightweight MCP server built with Go that allows AI agents to calculate and validate CVSS 2.0, 3.0, 3.1, and 4.0 Base Scores. It supports local stdio and remote Streamable HTTP connections, providing a single tool to determine severity based on complete Base vectors.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

CVSS Calculator MCP logo, by alfa-rezaCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-01Published by alfa-reza
MCP endpoint (Streamable HTTP)
https://cvss.my.id/mcp
Vendor documentation

What you can do with it

  • Calculate CVSS 3.1 Base Score for a given vector
  • Validate CVSS 2.0, 3.0, 3.1, and 4.0 Base Scores
  • Determine severity level from CVSS vectors

Source and maintenance

Community listingRegistry 1.0.0
mcp-registry: io.github.alfa-reza/cvss-calculator-mcp@1.0.0Source repository
Maintenance checked

Protocol and capabilities

Server
cvss-calculator-mcp 1.0.0
MCP protocol
2025-06-18
Tools
1 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Tools

1 advertised

calculate_cvss
Advertised by the server during the last successful anonymous check.

Calculate a CVSS Base-only score for 2.0, 3.0, 3.1 or 4.0. Supply every metric; never guess. v2: AV Access Vector, AC Access Complexity, Au Authentication, C/I/A Confidentiality/Integrity/Availability. v3: AV Attack Vector, AC Attack Complexity, PR Privileges Required, UI User Interaction, S Scope, C/I/A impact. v4: AT Attack Requirements, VC/VI/VA Vulnerable System impact, SC/SI/SA Subsequent System impact. Rejects non-Base metrics.

calculate_cvss input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "version",
    "vector"
  ],
  "properties": {
    "vector": {
      "type": "string",
      "maxLength": 1024,
      "minLength": 1,
      "description": "Complete case-sensitive Base-only vector. v2: AV L/A/N, AC H/M/L, Au M/S/N, C/I/A N/P/C. v3: AV N/A/L/P, AC L/H, PR N/L/H, UI N/R, S U/C, C/I/A H/L/N. v4: AV N/A/L/P, AC L/H, AT N/P, PR N/L/H, UI N/P/A, VC/VI/VA/SC/SI/SA H/L/N."
    },
    "version": {
      "enum": [
        "2.0",
        "3.0",
        "3.1",
        "4.0"
      ],
      "type": "string",
      "description": "CVSS version"
    }
  },
  "additionalProperties": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
230 ms
95th percentile latency
230 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 230 ms · metadata changed · 1 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http cvss-calculator-mcp https://cvss.my.id/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add cvss-calculator-mcp --url https://cvss.my.id/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable cvss-calculator-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "cvss-calculator-mcp": {
      "url": "https://cvss.my.id/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "cvss-calculator-mcp": {
      "type": "streamableHttp",
      "url": "https://cvss.my.id/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start cvss-calculator-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "cvss-calculator-mcp": {
      "type": "http",
      "url": "https://cvss.my.id/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http cvss-calculator-mcp https://cvss.my.id/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "cvss-calculator-mcp": {
      "url": "https://cvss.my.id/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "cvss-calculator-mcp": {
      "serverUrl": "https://cvss.my.id/mcp"
    }
  }
}

Let your agent find its tools

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